Boiler-furnace.



J. C. HEINRICH.

BOILER FURNAGB.

APPLIGATION FILED JUNE s, 1907.

N3 BHBETB-SHEET 1.

Patented May 13, 1913.

TF1/2d MW Y @Mv/W5@ J. C. HEINRICH.

BOILER PUBNAGE.

APPLIoATIoN FILED JUNBs. 1907.

Patented May 13, 1913.

asHnBTs-s-HEBT z.

vm wm. @MO/fz QCM?? UNITED i STATES PATENT OFFICE.-

JOHANNES CHRISTOPHER HEINRICH, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO HEINRICH MANUFACTURING COMPANY.

BOILEB-FURNACE Speciication of Letters Patent. Application med June 5, 1907.' serial No. 377,3oi.

Patented May 13, 1913.

5 of Milwaukee and State of Wisconsin, have invented certain new and useful Improve ments in Boiler-Furnaces, of which the following is a specification reference being had to the accompanying drawing, forming a part thereof.

This invention relates particularly to the class of furnaces employing heated air or mingled heated air and steam in forced draft. Its objects are to secure automaticregulation of steam pressure and forced draft, to effect a thorough preheating of the air utilized for draft, affording better combustion and creating a more intense heat than is possible with the ordinary furnace.

Other objects are to prevent the formation of clinkers on the grate, the deposit of soot upon the walls of the Iiues, to consume all combustible gases, and in general to provide an economical furnace.

It consists in certain'novel features of construction and in the arrangement of parts hereinafter particularlydescribed and pointed out in the claims.

In the accompanying drawings like letters designate the same parts in the several figures.

Figure 1 is a vertical longitudinal section on the line 1-1 Fig. Q, Fig. 2 is a horizontal seetion on line 2 2 Fig. 1, Fig. 3 is a transverse section on 'line 3-`3-Fig- 1. Fig. 4 is an enlarged detail vertical section of the steam blower forming part of the apparatus, and Fig. 5 is a plan view of the same. Fig. 6 is a vertical section of the steam blower base showing the blower (partly broken away) in place von the same, and Fig. 7 is a plan View of the blower base.

Referring to Figs. 1, 2 and 3 of the drawingso my invention is shown applied to a horizontal steam boiler a of a common .type having a steam dome b and to a furnace having a bridge-wall c and a wall d extending from the bridge wall to the rear wall and forming a chamber e under the combustion chamber adapted to heat air used for forced draft before it' is delivered to the fire. The rear wall has a large vertical flue f through which air is conveyed from the furnace room through a blower g to the air chamber e.

Steam is carried from the boiler through a pipe h including an automaticsteam pressure regulating valve z'. The pipe k also in-' cludes the hand valves h and h and a branch pipe j leads into and through the .flue f to two auxiliary blowers c-s located in the chamber e. l Referring to Figs. 4 and 5 the blower comprises a casing Z internally screw-thread ed for a portion of its length to engage an externally screw-threaded tubular nozzle m having a wrench-head m. At its lower end the casing l is internally tapered to engage the externally tapered end of the nozz and near this end is provided with an annular detlector n surrounded. by an annular channel n. A steam inlet o into which the pipe L is threaded.l is provided on one side of the casing opposite the annular deflector n, and on the side of the casing opposite the steam inlet o is a blow-out opening o on a line with the bottom of the annular channel n'. The blow-out opening is'normall closed with a cap or plug and has for its o ject to. permit blowing out dirt, scale, oil and other foreignmatter which might gather inthe channel n. At its u per end the casing is provided with a stu ng box comprising aA collar p fitting over the end of the casing, a packing land g between the casing and the Anozzle adjustably heldby the collar the latter having a .shoulder engaging an annular rib on the gland, and a quantityV of packing below the gland, this forming a steam tight joint between the casing and the nozzle. The nozzle m being adjustable lengthwise of the casing, by means of the screw-threaded engagement with the casing, the wrenchhead m being provided to permit the nozzle being raised and lowered the opening or slit l between the nozzle and the casing may be enlarged or reduced to admit more or less steam as is found most desirable in practice. The'lower end of the casing Z is externally screw-threaded to engage the internally screw-threaded tube r in the blower base shown in Figs. 6 and 7. The tube r is supported by a series of radial wings r in the center of a larger and longer tube s similarly supported by radial wings s in the center of the outer tube t which lits in the flue f resting on the plate u. The plate u is provided with bolt holes whereby it may be bolted or otherwise securely held on the fiue f.

With certain kinds of fuel and under certain conditions the auxiliary blowers k may be used. large lgflower g andare adapted to force heatedf air from the chamber c to twyer pipes c embedded in lire brick on each side of the combustion chamber and having outlets directed into and across the same,

`A large opening c in the bridge-wall c leads from the chamber 'e to the ash-pit of the furnace.

The operation of the furnace is as follows: Fire is. started in the grate in the manner usual to'Y ordinary furnaces, draft being supplied through the ash-pit and firebox doors until the steam-pressure has reached a predetermined point, then the hand-valve L in the steam pipe h is opened to admit steam to the blower g. The tire- 'box and ash-pit doors may then be closed,

the automatic regulating valve z' allowing steam to pass through the pipe h to the steamvblower g. Steam entering the annular channel ln through the opening 0 in the blower, circles around the same and impinging on the annular deflector n continues its course over it, and through the annular opening l between the casing and the tubular nozzle m. Issuing in an annular jet from the lower end of the nozzle, the steam entrains air downwardly through said nozzle from the upper part of the boiler-room where it is slightly heated, and forces the same through the tube 1" into the upper end of the larger tube s. As the combined column of air and steam issues from the lower end of the tube r it entrains more air through the openings at the upper end of the tube s between the wings 1" and mingling therewith issues from the 'lower end of said tube s, entraining a larger body of air through the openings between the upper ends of the tubes s and t. During its passage down the flue f and through the super-heating chamber e, the body of mingled air and steam is still further heated by the hot wallswith which it comes in contact, and passing thence through the opening c in the bridge wall and upwardly through the grate into the combustion chamber in a highly heated condition it readily combines. with and produces perfect combustion of the fuel. The fresh supply of mingled steam and air from the auxiliary blowers k, which is alsohighly heated in its passage through the twyer pipes v o on each side of the combustion chamber, furnishes the required oxygen in proper condition to combine withand produce complete combustion of the inflammable gases above the fire. The steam in the air serves to keep the fuel soft and porous and prevents clinkers from adhering to and burning the grate. The superheated air supplied by the auxiliary blowers being `very hot, all of the inflammable gases are consumed in the combustion chamber, thus preventing These blowers are similar to the .the deposit of soot upon the walls of the flue and stack and reducing the quantity of smoke emitted from the stack. lVlien the steam pressure in the boiler reaches a` predetermined point the automatic regulating valve z' cuts off the steam from the blowers and stops the forced hot air supply, thereby checking the fire. By this means the furnace is operated in the most economical manner. lVhen the steam pressure falls below the required limit, the automatic regulatlng valve z' will open, putting the blowers 1n operation until the steam has again reached the required pressure. A positive a'nd certain operation'of the draft regulatlon is thus secured and this operation, which usually requires careful watching on the'part of the engineer, is rendered practically automatic.

' Various changes vin the construction and arrangement ofl parts may be made without departing from the principle and intended scope of the invention.

I claim:

1. In a steam boiler furnace the combination with the colnbustion chamber, ash pit, grate and bridge wall, of an air heating chamber located behind the bridge wall and below the combustion chamber and lcommunicating with the ash pit through an opening in the bridge wall, a flue leading downwardly in the furnace wall into said heating chamber and having an air intake opening at'its upper end, a blower in said flue having a steam supply connection and an air inlet, a twyer pipe in the furnace wall leading from said heating chamber and having an outlet directed into and across the space above the grate, and an auX- iliary blower connected with said twyer pipe.

2. In a steam boiler furnace the combination with the combustion chamber, ash pit, grate and bridge wall of a heating chamber located behind the bridge wall and be' low and adjacent to the combustion chamber with which it communicates through the ash pit, a blower connected with said heating chamber and having an air intake opening and a steamrsupply connection with the kpjboiler, twyer, pipes communicating with and lea'ding'romf said heating chamber on oppositesides of the lcombustion chamber and having outlets directed across and ove' the grate and auxiliary :blowers arranged to force air from said heating chamber through said pipes into the combustion chamber, substantially as described.

3. In a steam boiler furnace the'combination with the combustion chamber, ash pit, grate and bridge'wall of a heating chamber located behind the bridge Wall and below and adjacent to the combustion chamber and communicating with the ash pit through an opening in the bridge wall, an

air supply flue leading downwardly in the furnace wall into said heating chamber and having an air intake opening at its upper end, a blower connected with the upper part of said flue and having a steam supply connection with the boiler, a twyer pipe leading from said heating chamber through the furnace wall to the combustion chamber above the rate and an auxiliary blower connected wlth said pipe and having a steam supply connection with the boiler, substantially as described.

4. In a steam boiler furnace the combination with the combustion chamber, ash pit, grate and bridge wall, of an air heating chamber located behind the brid e wall and below the combustion chamber, rom which it is se arated by a heat conducting wall, and en arging from the rear toward the bridge wall through an opening in which it communicates with the ash 1t, a blower connected with the smaller en of said heating chamber and having a steam supply connection and an air intake opening, a pipe leading from said heating chamber through the furnace wall to the combustion chamber above the grate and in front of the bridge wall, and a blower having a steam supply connection and arranged to force air through said pipe from the heating chamber into the combustion chamber.`

In witness whereof I hereto aix my signature 1n presence of two wltnesses.

JOHANNES CHRISTOPHER HEIN RICH.

Witnesses:

CHAs. L. Goss, HERBERT R. MANGER. 

